“Breakaway” by Avril Lavigne (better known from Kelly Clarkson’s 2004 album of the same name)
Avril wrote the tune for herself way back in 2002 for inclusion on her album Let Go, but was determined to be “unsuitable.” But it was certainly good enough for freshly minted American Idol star Kelly, who turned it into a massive hit!
“Toxic” by Cathy Dennis (better known from Britney Spears’ 2003 album In The Zone)
Dennis has given us some of the tastiest pop confection of the 21st century, helping to created this modern Britney classic, as well as Katy Perry‘s first smash “I Kissed A Girl,” Kylie Minogue‘s “Can’t Get You Out Of My Head,” and even the Jonas Brother‘s “Paranoid.”
“Telephone” by Britney Spears (better known from Lady Gaga’s 2009 album The Fame Monster)
REMIX! Now for a little variation on the theme: Lady Gaga indeed wrote her duet with Beyonce, but not before offering it to Britney Spears years earlier for year Circus album. Brit apparently passed after cutting a rough vocal demo, but it all worked out fine for Mother Monster in the end. “It’s fine because I love the song and I get to perform it now,” she said later.